Electric signalling system.



No; 678,475.. Paten ted July l6, I901.

H. a. CARLETON. ELECTRIC SIGNALING SYSTEM.

. (Application filed Sepji. 29 1900.)

3 Sheets-Sheet I,

(No Model.)

No. 678,475. Patented luly I6, I90L H. G. CABLETON. ELECTRIC SIGNALING SYSTEM.

(Application filed Sept. 29, 1900 (N0 lflodel.) 3 Sheets-Sheet 2.

y: NORRIS PETERS co, PNOTO LITHO., WASHINGTON. n. c

No. 678,475. Patented my I6, 1901.

v H. a. GARLETDN. ELECTRIC SIGNALING SYSTEM,

' (Application filed Sept. 29 1900. (No Modem 3 Sheets-Sheet 3.

N f i zzzw t': 7

UNITED" STATES.-

1 PATENT OF ICE.

HENRY GUY'OARLETON, OF NEW YORK, N. Y., AssIGNoRToTHE CARLETON ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC S I GNA LiNG SYSTEM.

- senorsrearron forming part of Letters Patent No. 678,475, dated July 16, 1901. Application filed September 29.1900. Serial lib/31,469. (No model.)

To 60% whom it may concern.-

Be it known that I, HENRYGUY CARLETON, a citizen of the United States, residing at New York, county of New York, and State of New 5 York, haveinvented certain new and useful Improvements in Electric Signaling Systems,- fully described and represented in the follow; ing specification and the accompany'ingdrawings,-forming a part of the same.

IO This invention relates to certain improvements in signaling apparatus. I

This invention has'for its obj eot to produc an improved signaling apparatus or system embodying a plurality of signaling instruments and a receiver, the said apparatus bea ing so arranged that any signaling instrument may be placed in operative connection with the receiver and that when such connection has been established any other sig- 2o naling instrumentis prevented from being connected to the receiver,whereby.interference on the line is avoided.

The invention further has for its object to improve the construction of the apparatus which is employed for carrying the invention into effect.

With these and other objects in View the invention consistsincertain constructions and in certain parts, improvements, and combinations, as will be hereinafter fullydescribed and thenispecificallypointed out in the claims hereunto appended.

In the-accompanying drawings, which form a part of this specification, and in which like characters. of reference indicate the same parts, Figure 1 is a front elevation ofthe selector employed to establish operative relation betweenthe signaling instruments and the receiver.- Fig. 2 is a side elevation of the 4o selector illustrated in Fig. 1, certain parts of the construction being shown in section. Fig. 3 is a top plan view of the selector. Fig. 4. is a rear elevation of theselector. Fig. 5 is a detail elevation, partly in section, of the motor-governorand the stopping mechanism for the selector. Fig.- 6 is a plan' view illustrating the connection between the motor and the selector and also showing the stopping device for theselector. Fig. 7 is a diagram: majtic view illustrating the circuits which'may be employed. i

In that embodiment of the invention which has been chosen for illustration a plurality of signaling instruments and a receiving mechanism are employed, and an operative relation is established between one of the signaling instruments and the receiving mechanism by means of a selector.

The selector mechanism employed maybe varied widely in construction. In its preferred form, however, said mechanism is of the sunflower type, consisting of an insulating-plate l, which is or may be supported on suitable standards 2 and is provided with a circularly-arranged series of terminals 3. A plurality of movable contacts is employed to cooperate with the terminals. In the construction shown these movable contacts consist of brushes 4 5, mounted on, but insulated from, an arm or carrier 6, which in the construction shown is mounted on a shaft 7, passing through an aperture 8 in the plate 1 and provided with a collar 9, against which the arm rests. The arm or carrier is held in position on the shaft by means of a jam-nut 1O or in any other suitable or desired manner. The shaft 7 is suitably mounted in a frame 12, extending rearwardly from the plate 1, said frame also serving to support the driving mechanism for the shaft 7, which will be hereinafter described. This frame 12 is or may be suitably supported on standards 13.

Any suitable form of driving mechanism may be employed, and this driving mechanism may be arranged to drive the shaft 7 and rotate the carrier 6 through any suitable or desired arrangement of gearing. Preferably, however, the motor employed will be an electric motor of an ordinary type. Inasmuch as 7 the construction of the motor forms no part 0 of the invention, the same is not illustrated. The field-magnet of the motor is, however, indicated at 14, and the main shaft is indicated at 15. The driving-gear of the motor-shaft is marked lo, and a suitable train of gearing 17 5 is used to convey the movement from the gear 16 to the shaft 7. In the construction shown the train terminates in a worm 18, which engages with a worm-gear 19 on the shaft 7.

It is desirable to make the terminalson the selector-plate small in order that they may be brought close together, thus making it possible to construct a plate having a large number of terminals without unduly increasing the size of the plate and the length of the carrier. In order to do this, however, it is desirable to so arrange the driving mechanism and the selector-arm as to bring the arm to an immediate stop with respect to any contact on the plate, thereby preventing the arm from overrunnin g. \Vhile the selector mechanism and its driving mechanism may be variously arranged in order to effect the result desired, the construction will preferably be such as to enable the selector-arm to be brought to a stop without necessarily checking the action of the driving mechanism, so that although the arm is stopped the driving mechanism may continue to run. Many constructions varying widely in form may be employed for this purpose. In the construction shown, however, afriction-clutch is employed, and said clutch is introduced between the motor-shaft and the driven gear on the shaft 7 of the movable carrier or arm 6. \Vhile this friction-clutch may be located at any desired point, in the construction shown the gear 16 of the motor-shaft is connectedto a sleeve 20, which finds its bearing in one of the cross-bars of the frame 12 and forms the hub of a disk 21. The sleeve 20 is arranged so that the shaft 15 may turn loosely therein, and mechanism is provided for connecting the sleeve to and disconnecting it from the shaft. In the construction shown the disk 21 has pivoted thereto (see Fig. 6) a pawl 22, which engages with the teeth of a ratchetwheel 23, rigidly secured to the shaft 15 and in the construction shown formed integrally therewith. As indicated in Fig. 6, the nose of the pawl 22 points in the direction of rotation of the shaft 15 and toward the acute angle formed by the teeth of the ratchet 23. A spring 21-, secured to the disk 21, bears against the nose of the pawl and holds the same strongly against the teeth of the ratchet. Inasmuch as the pawl, as has been stated, points in the direction of rotation of the ratchet and shaft, the ratchet would not, except for the spring, operate the disk 2-1, to which the pawl is secured. The spring 24, however, forces the pawl against the ratchetteeth with suliicient pressure to cause the ratchet to turn the disk 21 when the motor is running. \Vith this construction, however, it is clear that the rotation of the disk 21 may be brought to a stop and the shaft 15 continue to turn, the teeth of the ratchet slipping under the nose of the pawl.

Any suitable means may be employed for stopping the rotation of the disk 21, thus stopping the rotation of the gear 16, which is fast to the sleeve of the disk, and, through thetraiu before described, the rotation of'the shaft which carries the carrier-arm. In the construction shown the rotation of the disk 21 is stopped bymeans of a brake-lever 25, pivoted at 26 to the frame 12. The brakelever may be actuated in any suitable manner. In the construction shown, however, one end of this lever forms the armature of a club-foot magnet 27, secured to a bracket 28 on the frame 12.

Each of the terminals 3 is suitably connected with a signaling instrument. While any suitable or desired form of signaling instrunient may be employed, that which is shown and which will preferably be used is theon'e illustrated in Patent No. 653,469, dated July 10, 1900. Reference is made to said patent for a full description of the construction and operation of this signaling instrument. For the purpose of this application, however; it is suflicieut to state that each signaling in-' strument (see Fig. 7) employs two semicircular conducting-plates 29 30. The plate 29 is provided with two groups of contacts 31 and 32, and the plate is provided with two groups of contacts 33 and 3t. Cooperating with these contacts is a rotating 'arm or carrier 35, said arm carrying contact springs or brushes 36 and 37,insulated therefrom. These springs are thrown into and out of circuit with the arm by means of movable circuitcontrollers 3S and 39, the construction and operation of which are fully set forth in the patent above referred to. In'the operation of the signaling instrument the arm or carrier 35 is caused to rotate and the spring 36 thereby caused to sweep over the group of contacts on the plate 30, sendingin a succession of impulses according to the number of contacts made. At the same time the spring 37 is caused to sweep over'the contacts on the plate 29 and send in a succession of impulses ac cording to the number of contacts made. The carrier or arm 35 is caused-to rotate by means of a spring-driven sector, (indicated at 40 in Fig. 7,) said sector being thrown into opera-- tion by means of a handle in the manner fully described in the patent referred to. This sector engages with a suitable gear on the shaft of the carrier-arm 35 and rotates said carrierarm. While the handle referred to may be operated andthe spring-driven sector placed in position for operation at any desired time, the mechanism is locked against rotation and the carrier-arm 35 is only allowed to move when the locking mechanism is released. The locking mechanism employed is fully described in the patent referred to. In the present application this locking mechanism is diagrammaticallyrepresented by means of a notched wheel 41, which is engaged by a tooth'on an armature-lever 42, the magnet for said 'lever being represented at 43. When this magnet isenergized and attracts its armature'lever, the tooth will be lifted out of engagement with the toothed wheel 41, and the mechanism is allowed to rotate under the influence of the spring-driven sector. As

'long,however, 'as the tooth remains in enin from the signaling instruments. Preferably, however, and as stated in the patent referred to, the receiving mechanism will consist of a recorder of the two-pen type. Inasmuch as the construction of such recorders is well known and forms no part of this invention, it is not illustrated. The magnets of said recorder, however, are diagrammatically represented and are marked 44 and 45.

It has been heretofore stated that while the motor employed for driving the selector may be of any desired type-such, for instance, as a spring-motor-it will preferably be an electric motor. A suitable circuit and source of electrical energy must therefore be provided for operating this motor. The circuit by which the electrical energy is conveyed to the motor is herein termed the motorcircuit. While, however, the motor-circuit in the preferred form of the construction operates to convey the electrical energy directly to the motor, it will be understood that the term motor-circuit is meant to include any circuit by which the operation of the motor is controlled. Thus, for instance, were a spring-motor provided with a locking mechanism which was released to allow the motor to operate employed, the circuit which operated the releasing devices would fall within the scope of the term motor-circuit, and were a constantly-running motor employed the circuit by which the action of the motor on the selector is controlled would similarly fall within the term motor-circuit.

\Vhile the motor-circuit may be variously arranged, in the preferred form of the construction it will consist of a local circuit deriving its energy from a suitably-arranged battery and controlled by a suitable form of electrically-operated circuit-controlling devices, preferably a relay. In the construction shown (see diagram Fig. 7) the motorcircuit battery is marked 46. Fromthis battery a wire 47 leads to the armature 48 ofthe relay-magnet 49. From a contact 50, with which the armature 48 cooperates, a wire 51 leads to one of the brushes 52 of the motor, and from the other brush 53 a wire 54 leads to the battery 46.

The main source of electrical energy by which the impulses from the signaling instruments are caused to operate the receiver is indicated by abattery marked 55. From this battery a main line 56 is led, said line havingv branches 57, which lead to the signalinginstruments. Acominon return 58 leads from the other side of the battery 55, said common return connecting with a number of branch circuits, to be hereinafter described.

The system is so arranged that when any 5 signaling instrument is operated it will throw themotor-circuit into operative condition, so as to cause the motor to drive the selector in order that theproperbrush on the movable selector-arm may makecontact with the terminal to which the signaling instrument which has been operated is connected. A

suitable electrically-operated controlling device, which as shownis a relay, is provided for the motor-circuit, said controlling device being included in a suitable controlling-circuit. By means of this controlling-circuit each signaling instrument is enabled to throw the motor-circuit into operative condition. Since, furthermore, it is desirable in order to prevent interference that only one signaling instrument have control of this controlling circuit at a time, means are provided for rendering this circuit inoperative as soon as the receiver begins to take a signal from any given instrument. While the means by which the controlling-circuit is rendered inoperative may be varied in form, they will preferably be arranged so as to be operated from the receiver. When, therefore, any signaling instrument has placed the controlling-circuit in operative condition and the controlling-circuit has in turn placed the motor-circuit in operative condition and the resulting movement of the selector through circuits hereinafter described has started the receiver, the controlling-circuit is immediately broken and remains broken until the receiver has ceased to operate.

In the construction shown each of the signaling instruments is provided with a terminal 59, secured to an insulating-block 60. From this terminal 59 is led a branch wire 61, and the branches 61 from all the instruments are connected to a wire 62, which leads into the relay-magnet 49. From the relay-magnet 49 a wire 63 is led, said wire terminating in the circuitcontroller referred to, from which device the current goes back to the battery by the common return 58. While the circuit-controller which controls this starting circuit may, as has been indicated, be of any suitable construction, one is diagrammatically indicated which is common in printingtelegraphs. The wire 63 is connected to a contact 64, which is carried on a pivoted arm 44 which is operated from the armature of the printing-magnet 44. The common return 58 is connected to a contact 65, which is mounted on a shaft 44*, which forms a part ofrthe recording mechanism. This shaft is provided with a worm 44, which is engaged by a pin 44 carried on the arm 44. When the magnet 44 is energized and its armature is attracted, the arm 44 is moved so that its contact 64 passes out from under the contact 65 on the shaft 44", which being a part of the recording mechanism at once begins to rotate. As long as the armature of the printing-magnet continues to move the arm 44 will be kept out of a position where the contact 64 can be struck by the contact 65 on the shaft 44". When, however, the armature ceases to vibrate, the pin 44 engages the worm 44 and the arm 44 is moved up to a point where the contact 65 will strike the contact 64 and the circuit be closed.

Cooperating with the terminal 59, which has been described as located in the signal ing instrument and secured to the same insulating-block 60, is a movable spring-contact 66, said contact being in the path of the spring-driven starting-sector 40 of each of the signaling-boxes. When, therefore, the starting-sector 40 of any signaling-box is thrown over so as to strike the movable contact 66, this contact is forced against the contact 59.

In the diagram illustrated in Fig. 7 two signal-boxes (marked A and B) are shown, and the movable starting-sector 4:0 of the box A is shown in the position which it occupies when it has struck the contact 66 and forced the same against the cont-act 59. Then the apparatus is in this condition, the current, starting from the main battery 55, flows through the wires 56 and 57 into the signaling instrument,through the starting-sector 40, the contacts 66 and 59, and the wires 61 and 62, into the relay-magnet 49. From the relaymagnet 49 the current goes by the wire 63 through the circuit maker and breaker 64 and 65 to the common return-wire 58. This energizes the magnet 49 and causes it to attract its armature 48, thus closing the local circuit leading from the motor-battery 46 through the motor. The motor is started, therefore, and the selector-arm 6 rotates, causing the brushes 4 and 5 to sweep over the terminals.

Each of the terminals 3 is connected to the lower semicircular plate 29 of one of the signaling instruments,this connection being effected in the construction shown by means of a wire 67. The brush 4 (see Fi 2) is directly connected to the shaft by means of a wire 68, and the current is taken from the shaft by means of a brush 69 and a wire 70. (See Fig. 2.) The brush 5 is connected by means of a wire 71 to a sleeve 72, insulated from the shaft, and the current is taken'from this sleeve by means of a brush 73 and a wire 74. Two circuits, therefore, lead from the selector, one running by way of one brush and one by the other brush, and the construction must be such that each of these circuits can be connected to the circuit, to be hereinafter described, which contains a magnet of the receiver. Furthermore, the means by which either selector-circuit is connected to the receiver-magnet circuit must be such as not only to etfect the connection from any instrument through the selector to the recorder-magnet, but also to prevent a similar connection between any other instrument and the magnet through the other brush while the first connection remains established.

In order to connect either selector-circuit to the circuit containing a receiver-magnet and to prevent the other circuit from the selector from being connected to the receivermagnet circuit while the first circuit is established, there is provided what is herein termed a multiple-circuit controller. This multiple-circuit controller may vary widely in construction. In its preferred form, however,

mats

this controller consists of a differentiallywound polar relay. The coils of this relay are marked 75, 76, 77, and 78, and the -arma ture is marked 79. The contacts with which the armature cooperates are marked, respectively, SU and 81. The wire 70, which has been heretoforedescribed as connected with the brush 4, leads from the coil 75 of one of the magnets ofthe relay, whence the current goes by a wire 82 to the coil 76 of the other magnet of the relay. Each magnet of the relayis in a branch from the main-line circuit. From the coil 76 the current goes by means of a wire 82 to a contact 83, forming a part of a circuit controller to be hereinafter described. The contact 83 cooperates with a contact 84, which is connected by means of a wire 85 to abranch 86, said branch being connected to the common return 58. The wire 74 from the selector-brush 5 runs to the coil 78 of the polarrelay, before referred to,whence the current goes by means of a wire 87 into the coil 77 of the other magnet of said relay. From this coil the current goes by means of a wire 88 to a contact 89, forming a part of the circuit-controller before referred to and which will be hereinafter described, which contact cooperates with a contact 90, connected by means of a short wire 91 to the wire 86. The contact of the polar relayis connected by means of a short wire 92 to the wire 70, and the contact 81 is-connected by means of a short wire 93 to the wire 74. The armature 79 has connected to it a wire 94, which wire leads to the magnet 44 of the receiver. From the magnet 44abranch wire 95 is led, said branch being connected to the common return 58.

The polarrelay forming the multiple-circuit controller is so wound and polarized and the circuits so arranged that when the current enters either winding of the relay the armature will be moved so as to shunt the coils which caused the movement'of the armature. When, therefore, the current passes by means of the wire v7O from the selector into the coils 75 76, the armature is moved so as to strike the contact 80. The current, therefore, which passes through the coils 7 5 and 76 now finds a shorter path and goes by the wire 92, the contact 80, the armature 79, and the wire 94 into the magnet of the receiver, and thence by the Wire 95 to the common return and back to the battery.

The contacts 83 and 89, hereinbefore referred to as forming a part of the branch-circuit controller, are carried on an armature 96, which is controlled by amagnet 97. The purpose of this branch-circuit controller is to render inoperative the branch circuit containing the magnet-coils of the multiple-circuit controller as soon as the selector, operating through the multiple-circuit controller, has established a connection between any signaling instrument anda receiver-magnet. A suitably-arranged circuit is therefore provided for the magnet 97, and this circuit is arranged so as to be rendered inoperative Whenever the selector has established the connection referred to. In its preferred form this circuit will be arranged as a branch circuit from the motor-controlling circuit. In the diagram this circuit is indicated by a wire 98, which leads from the motor-circuit wire 51 into the magnet 97, and by a wire 99, which leads from the magnet to the wire 54 of the motor-circuit. When, therefore, the motorcircuit is closed through the action of the armature 48 of the magnet 49, a circuit is not only established from the battery 46 through the motor, but a circuit is also established in the same battery through the magnet 97, causing it to attract its armature 96, thus closing the branch circuit containing the coils of the multiple-circuit controller and placing the branch circuit containing the coils of the polar relay forming the multiple-circuit controller in operative condition.

It is obvious, of course, that'before any signals can be sent over the line the locking mechanism which holds the operating mechanism of the signaling instrument stationarymust be released, so that the carrier-arm 35 can start in its revolution. While this f unction may be effected by various arrangements of devices, in the preferred form of the construction this function is effected through the selector mechanism. To this end the starting-magnet 43, which has been before described as controlling the locking-armature 42, is connected by means of a wire 100 to the contact 66 in the signaling instrument. From the magnet 43 a wire 101 is led, which connects with the lower semicircular plate 29 of the signaling instrument, said plate 29 in each signalinginstrument being, as before stated, connected to a terminal of the selector mechanism by means of the wire 67.

It has been heretofore stated that the selector mechanism is brought to a stop at the proper time by means of a brake 25, cooperating with the friction-disk 21, said brake being the armature of the magnet 27. A suitable circuit is provided for this magnet, and

this circuit is preferably so arranged that it will be only operated when the motor is actually running, it being unnecessary to hold the brake 25 on the disk 21 when the motor has been brought to a stop. In the preferred construction, the motor-shat t 15 carries a ballgovernor, the arms of which are indicated at 105. These arms in their outward movement are arranged-to strike against stops 106,'carried on a cross-bar 107, which is suitably connected to the motor-shaft. This governor in the preferred construction is arranged to control the brake-circuit. In the construction shown this brake-circuit is arranged as follows: From the brake-magnet 2'7 a wire 108 is led, said wire terminating in a contact 109, which serves as a back-stop for the relay-armature 48. From the other side of the magnet a wire 110 is led, said Wire terminating in a brush 111, which rests on an insulated collar nccting with the wire 54, which forms a part of the motor-circuit.

Only one of the magnets 44 of the two-pen recorder, which, as before stated, is the pre ferred form of the receiving mechanism,'has been specifically referred to. The circuit for the other magnet 45 of this recorder, which is intended to receive the impulses sent through the upper semicircular plate of each instrument, may be variously arranged. As shown, each of said plates 30is connected by a branch 116 to a main line 117, which runs into the magnet 45. From the other side of the magnet a wire 118 is led, said wire joining the common return 58.

The construction and arrangements of circuits being as before described, the operation of the apparatus is as follows: In the diagram illustrated in Fig. '7 the signaling instrument A is shown as having been operated-that is to say, its driving-sector 40 has been pulled over against the stress of its driving-spring and the contact 66 has been forced against the contact 59. When the contact 66 strikes the contact 59, a circuit is established from the main battery 55 through the wires 56 57 into the signaling instrument. From the in strument the current goes by way of the sec tor 40, the contacts 66 and 59, and the wires 61 and 62 into the magnet 49, which controls the relay for the motor-circuit. From this mag net the current goes by Way of the wire 63, the contacts 64 and 65, and the common return 58 back to the battery. The magnet 49 being thus energized attracts its armature 48, which flies over against its stop 50. This movement of the armature establishes the motor-circuit, the current running from the battery 46 by way of the wire 47, the arma ture 48, the contact 50, and the wire 51 to the motor-brush 52. From the other brush 53 the current goes by way of the wire 54 back to the battery. Simultaneously with the closing of the motor battery-circuit the branch circuit, which contains the magnet for the branch-circuit cont-roller of the polar-relay multiple-circuit controller, is energized, the current going from the wire 5l by way of the wire 98 through the magnet 97 and from this magnet by way of the wire 99 to the wire 54 and into the battery. The movement of the starting-sector 40, therefore, has started the motor for the selector mechanism and has placed the circuit which is controlled by the multiple-circuit controller in operative condition. The motor continues to drive the arm of the selector mechanism until one of the brushes 4 5 strikes the terminal which is connected to the instrument which has been operated. In the present instance the brush 4is shown in contact with the terminal of the selector to which the instrument A is connected.

As soon as the brush reaches the contact a circuit is established from the main battery, as before, into the signaling instrument, and from the contact 66 and the 'wire 100 to the starting-magnet 43, and from this magnet by the wire 101 to the lower semicircular plate 29 of the signalinginstrument. From the plate 29 the current flows by means of the wire 67 to the terminal of the selector, from the selectorbrush 4 through the wire 70, the coils 76 of the polar-relay multiple-circuit controller, the wire 82, the contacts 83 84, the wires 86, and the common return 58 back to the battery. This current energizes the magnet 43 to release the rotating arm 35 of the signaling instrument, and at the same time throws the armature 79 of the polar relay over against its stop 80, shunting the coils 75 76. rent which is running over the wire 70 from the selector-brush 4 now runs by way of the wire 92 to the contact 80, from this contact through the armature 79 and the wire 94 to the receiver-magnet 44, and from this magnet by way of the wire and the common return 58 back to the battery. This establishes a closed circuit through the receiver-magnet 44andthestarting-magnet43. Itthewindings of these two magnets 43 and 44 were the same, they would both attract their armatures. This would, however, produce an unnecessary and undesirable movement of the armature of the pen-magnet. The pen-magnet 44 is therefore so wound with respect to the startingmagnet that the current, while it is sufficient to cause the starting-magnet to attract its armature, will not cause the pen-magnet to actuate its armature. As soon as the startingmagnet 43 is operated and the driving mechanism of the signaling instrument is released the segment 40 starts to move and permits the contact 66 to move away from the contact 59. This breaks the circuit through the magnet 49 and permits the armature 48 to move back against its back-stop 109. This movement of the armature breaks the motor-circuit and at the same time establishes a circuit through the brake-magnet 27, the current flowing from the motor-battery by way of the wire 47 to the armature 48, from this armature by way of the contact 109 and the wire 108 to the magnet 27, from this magnet by way of the wire 116, the brush 111, the wires 113 and 114, the governor-arm 105, and the wire back to the battery. It will be remembered that at this time the motor is running, so that the governor-arms are thrown out against their stops 106. The momentum of the motor will usually be sufiicient to cause it to run, notwithstanding the fact that its circuit has been broken, and by establishing the circuit through the brake-magnet 27 and applying the brake the selector mechanism is brought to an instantaneous stop, notwithstanding the fact thatthe motor continues its movement under the influence of its momentum. The movement of the driving-sector 40 causes the rotation of the arm 35, and as the The cur brush 37 strikes the first contact on the lower plate 29 a circuit is established from the battery 55 through the wires 56 and 57, as before, into the signalinginstrument through the controller 39, the brush 37, and the contact on the plate 29. From the plate 29 the circuit goes by. the wire 67 through the selector mechanism and by the wire 70, the wire 92, and the contact 80 to the armature 79 of the multiplecircuit-controller relay. From this armature the circuit goes by the wire 94 through the magnet 44 and then by the wire 95 and the common return back to the battery. This current energizes the magnet 44 and causes it to attract its armature and efiect the printing. the magnet 44 moves the contacts 64 and 65 are separated and the circuit through the magnet 49 is broken, and this circuit will remain broken until the receiver has finished receiving its signal. It, therefore, during the operation of the instrument A the startingsector 40 of the instrument B is pulled over, the circuit cannot be established through the magnet49. The motor-circuit cannot, therefore, be reestablished until the circuit of the magnet 49 is closed at the contacts 64 65, which, as has been before said, cannot occur until the printing-magnet has finished receiving its message. \Vhile the arm 35 is rotating and the brush 37 is making its contacts with the terminals on the plate 29, the brush 36 is similarly making contacts with the terminals on the plate 30 and sending impulses through the circuit of the magnet 45, the manner in which this is done being fully set forth in the patent hereinbefore referred to. It may be stated, however, in this connection that the signaling instrument, as set forth in said patent, is so arranged that when once started its carrier-arm 35 will make a halfrevolution before the instrument ceases to operate. The breaking of the motor-circuit by the movement of the armature 48 not only operates to cut off the current from the motor and apply the brake to the selector mechanism, as has been described, but also deenergizes the magnet 97. This permits the armature 96, carrying the contacts 83 and 89, to move away from the contacts 84 and 90, thus breaking circuit through the coils of the multiple relay and preventing any disturbance of the polarized armature, which might otherwise occur should the particular instrument on the line he opened which is connected to the terminal upon which the brush 5 rests when the brush 4 has found a live wire be operated. In other words, if it be assumed that the instrument B be connected to the terminal on which the brush 5 rests at the time the brush 4 is resting on the terminal connected with the instrumentA it will be seen that by pulling over the starting-sector 40 of the instrument B if the branch 86 were not broken a current would be set up through its contact 66, its starting-magnet 43, its plate 29, the selector mechanism, and the coils of As soon, however, as the armature of the polarized relay. strong enough to pull over the relay or at least to interfere with the contact which itis making and would in any event operate the starting-magnet of the instrument B and release the instrument, thereby causing interference on the line.

It will be understood that the agencies employed in carrying the invention into effect and the arrangement of the circuits may be varied within wide limits. The invention is not, therefore, to be restricted to the precise agencies and arrangement of circuits hereinbefore described.

What is claimed is 1... In an electrically-controlled signaling system, the combination with a plurality of signaling instruments each having a starting mechanism, of a receiver, aselector, circuit connections controlled by the selector whereby each of the signaling instruments may be independently connected with the receiver and whereby the selector operates the starting mechanism of each instrument, and means for preventing the receiver from being connected to more than one instrument at a time, substantially as described.

2. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments each having a starting mechanism, of a selector, circuit connections between each of the instruments and the selector, a receiver, means for establishing circuit connections between the receiver and the selector, whereby the selector may establish circuit connections between any signaling instrument and the receiver and may operate the starting mechanism of each instrument, and means for preventing the selector from establishing a connection with more than one signaling instrument at a time, substantially as described.

3. In an electricallycontrolled signaling system, the combination with a plurality of signaling instruments, of a selector, circuit connections between each of the instruments and the selector, a receiver, means for establishing circuit connections between the receiver and the selector, whereby the selector establishes circuit connections between any signaling instrument and the receiver, and means controlled by the receiver for preventing the selector from establishing. a connection with more than one signaling instrument at a time, substantially as described.

4-. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments each having a starting mechanism, of a selector, a receiver, suitable circuit connections whereby the selector is enabled to throw each of the signaling instruments into circuit with thereceiver and operate the starting mechanism of each instrument, suitable devices for throwing the selector into operation, a circuit including said devices and adapted to be rendered operative This current might be means for rendering said circuit inoperative during the time when the receiver is receiving a'signal from any signaling instrument, substantially as described.

5. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments, of a selector, a receiver, suitable circuit connections whereby the selector is enabled to throw each of the signaling instruments into circuit with the receiver, suitable devices for throwing the selector into operation, a circuit including said devices and adapted to be rendered operative by each of the signaling instruments, and means controlled by the receiver for rendering said circuit inoperative during the time when the receiver is receiving a signal from any signaling instrument, substantially as described.

6. In an elect-rically-controlled signaling system, the combination with a plurality of signaling instruments each having a starting mechanism, of a selector, a receiver, suitable circuit connections whereby the selector is enabled to establish a circuit between each of the signaling instruments and the receiver and operate the starting mechanism of each instrument, a motor-circuit for the selector, a controlling-circuit for the motor-circuit,said controlling-circuit being adapted to be rendered operative by any of the signaling instruments, and means for rendering said'controlling-circuit inoperative when the receiver is receiving a signal from any of the signaling instruments, substantially as described.

7. In an electricallycontrolled signaling system, the combination with a plurality of signalinginstruments,of a selector,areceiver, suitable circuit connections whereby the selector is enabled to establish a circuit between each of the signaling instruments and the receiver, a motor-circuit for the selector, a controlling-circuit for the motor-circuit, said controlling-circuit being adapted to be rendered operative by any of the signaling instruments,-and means controlled by the receiver for rendering said controlling-circuit inoperative when the receiver is receiving a signal from any of the signaling instruments, substantially as described.

8. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments each embodying a starting mechanism, of a receiver, a selector, suitable connections controlled by the selector, whereby the selector is enabled to throw the receiver into circuit with each of the signaling instruments, suitable circuit connections whereby the selector operates the starting mechanism of the signaling instruments, opcrating devices for the selector, a circuit including said operating devices which is adapted to be rendered operative by each of the signaling instruments, and means whereby said circuit is rendered inoperative when the selector has thrown any of the signaling inby each of the signaling instruments, and, struments into circuit with the receiver and the receiver is receiving a signal therefrom, substantially as described.

9. In an electrically-controlled signaling system, the combination with a plurality of signalinginstruments each embodyingastarting mechanism, of a receiver, a selector, suitable connections controlled by the selector, whereby the selector is enabled to throw the receiver into circuit with each of the signaling instruments, suitable circuit connections whereby the selector operates the starting mechanism of the signaling instruments, operating devices for the selector, a circuit including said operating devices which is adapted to be rendered operative by each of the signaling instruments, and means controlled by the receiver whereby said circuit is rendered inoperative when the selector has thrown any of the signalinginstruments into circuit with the receiver and the receiver is receiving a signal therefrom, substantially as described.

10. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments, each including a starting mechanism, of a receiver, a selector, suitable circuit connections whereby the selector is enabled to throw any of the signaling instruments into circuit with the receiver, a motor-circuit controlling the action of the selector, a controlling-circuit for the motorcircuit, said circuit being adapted to be rendered operative by each of the signaling instruments,suitable circuit connections whereby the selector is enabled to throw the start ing mechanism of each instrument into operation, and means whereby the controlling-circuit for the motor-circuit is rendered inoperative whenever the selector has established a circuit connection between any signaling instrument and the receiver and the receiver is receiving a signal therefrom, substantially as described.

11. In an electrically-controlled signaling system, the combination with a plurality of signaling instrument-s, each including a starting mechanism, of a receiver, a selector, suitable circuit connections whereby the selector is enabled to throw any of the signaling instruments into circuit with the receiver, a motor-circuit controlling the action of the selector, a controlling-circuit for the motorcircuit, said circuit being adapted to be rendered operative by each of the signaling instruments,suitable circuit connections whereby the selector is enabled to throw the starting mechanism of each instrument into operation, and means controlled by the receiver whereby the controlling-circuit for the motorcircuit is rendered inoperative whenever the selector has established a circuit connection between any signaling instrument and the receiver and the receiver is receiving a signal therefrom, substantially as described.

12. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments, each of which includes a starting mechanism,of a receiver,a selector, and suitable circuit connections whereby the selector may throw any signaling instrument into circuit with the receiver and operate the starting mechanism of the instrument so connected, substantially as described.

13. In an electrically-controlled signaling system, the combination with a plurality of signalinginstruments,ofareceiver-,a selector, suitable circuit connections whereby the selector is enabled to throw each of the signaling instruments into circuit with the receiver, means for preventing the receiver from being connected to more than one instrument at a time, a motor for driving the selector, a stopping mechanism which acts upon the sclector independently of the motor, and means for operating said stopping mechanism, substantially as described.

14. The combination with a plurality of signaling instruments,of a receiver,a selector having a plurality of stationary contacts and a plurality of movable contacts, and suitable circuit connections whereby each movable contact may establish a circuit between the signaling instrument and the receiver, substantially as described.

15. The combination with a plurality of signaling instruments, of a receiver, a selector having a plurality of stationary contacts and a plurality of rotating contacts, and suitable circuit connections whereby each movable contact may establish a circuit between the signaling instruments and the receiver, substantially as described.

16. The combination with a plurality of signaling instruments, of a selector embodying a movable arm carrying a brush and a plurality of contacts with which said ,brush cooperates, said contacts being in circuit with the signaling instruments, a motor for d-riving the selector-arm, and a stopping mechanism for the arm, said stopping mechanism operating upon the arm independently of the.

motor, substantially as described.

17. The combination with a pluralityofsignaling instruments, of a selector embodying a movable arm carrying a brush and a plurality of contacts with which said brush cooperates, said contacts being in circuit with the signaling instruments, a motor for driving the selector-arm, a friction connection between the motor and the arm, and a brake mechanism whereby the movement of the arm may be stopped and the motor permitted to run, substantially as described.

18. The combination with a selector embodying a movable arm carrying a brush and a plurality of contacts with which said brush cooperates, a motor for driving the selectorarm, a friction connection between the motor and the arm, electrically operated brake mechanism whereby the movement of the arm may be stopped and the motor permitted to run, a suitable circuit for said brake mechanism, devices controlled by the movement of the motor for placing said circuit in operative condition, and circuit controlling devices, substantially as described.

19. The combination with a selector embodying a movable arm carrying a brush, and a plurality of contacts with which said brush cooperates, a motor for driving the selectorarm, a friction connection between the motor and the arm, an electrically-operated brake mechanism whereby the movement of thearm may be stopped and the motor permitted to run, a suitable circuit for said brake mechanism, an arm on the motor-shaft thrown into operative position by the movement of the shaft and when in said position adapted to place the brake-circuit in operative condition and circuit-closing devices, substantially as described.

20. The combination with a selector embodying a movable arm carrying a brush, and a plurality of contacts with which said brush cooperates, an electric motor'for driving the arm, a suitable circuit for energizing the motor, a friction connection between the motor and the arm, an electric brake mechanism for stopping the movement of the arm, a circuit for said brake mechanism, and a single-circuit-controlling device operating to render the motor-circuit operative and the brakecircuit inoperative and vice versa, substantially as described. I

21. The combination with a selector embodying a movable arm carrying a brush, and a plurality of contacts with which said brush cooperates, an electric motor for driving the arm, a suitable circuit for energizing the motor, a friction connection between the motor and the arm, an electric brake mechanism for stopping the movement of the arm, a circuit for said brake mechanism, devices controlled by the movement of the motor for placing said circuit in operative condition, and a single circuit-controlling device operating to render the motor-circuit operative and the brake-circuit inoperative and vice versa, substantially as described.

22. The combination with a selector embodying a movable armcarrying a brush and a plurality of contacts with which said brush cooperates, of an electric motor ,for driving the arm, a friction-clutch between the motor and the arm, a suitable circuit for energizing the motor, an electric brake mechanism for stopping the movement of the arm, an arm on the motor-shaft, a stop against which the arm is thrown by the rotation of the shaft, a circuit for the brake mechanism including the arm and stop, and suitable circuit-closing devices for rendering the motor-circuit operative and the brake-circuit inoperative and vice versa, substantially as described.

23. In an electrically-controlled signaling system, the combination with a'plurality of signaling instruments, of a selector embodying a seriesof terminals and tworotating brushes, circuit connections between the terminals and the signaling instruments, circuit connections ileadingfrom each brush, a

receiver, a multiple-circuit controller, and circuit connections between the multiple-circuit controller and the receiver whereby the controller is enabled to establish a connection between either brush and the receiver, substantially as described.

2a. In an'electrically-controlled signaling system, the combination with a plurality of signaling instruments, of a selector embodying a series of terminals and two rotating brushes, circuit connections between the terminals and the signaling instruments, circuit connections leading from each brush, a receiver, a multiple-circuit controller, circuit connections between the multiple-circuit controllerand the receiver whereby the controller is enabled to establish a connection between either brush and the receiver, and means for preventing a circuit from being established between the receiver and one brush whenever the selector has operated to establish a connection between the receiver and the other brush, substantially as described.

25. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments, of a selector embodying a series of terminals and two rotating brushes, circuit connections between the terminals and the signaling instruments, a polarized relay, circuit connections leading from one of the brushes to one set of coils of the relay, circuit connections leading from the other brush to the other set of coils of the relay, energizing-circuit connections leading from the relay-coils, said connections including a suitable source of electrical energy with which the signaling instruments are in circuit, a receiver, circuit connections between a magnet of the receiver and the armature of the relay, and a pair of contacts cooperating with the relay-armature, one of said contacts being in circuit with one set of connections from the vselector to the relay-coils and the other contact being in circuit with the other set of connections from the selector to the re lay-coils, the coils being so wound and the armature so polarized as to shunt the coils which cause the movement of the armature, substantially as described.

- 26. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments, of a main line to which said instruments are connected, a selector comprising a series of terminals and two rotating brushes, circuit connections between the terminals and the signaling instruments, a polarized relay, circuit connections between one of the brushes of the selector and one set of coils of the relay, circuit connections between the other brush and the other set of coils of the relay, a branch from the main line return forming an energizing-circuit for the relay-coils, a receiver, a branch from the main-line return including a magnet of the receiver and leading to the relay-armature, a pair of contacts with which the relay-armature cooperates, one of said contacts being in circuit with one set of connections from the selector to the relay-coils and the other contact being in circuit with the other set of connections from the selector to the relay-coils, the coils being so wound and the armature so polarized that the movement of the armature shunts the coils which cause the movement of the armature, substantially as described.

27. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments, of a selector embodying a series of terminals and two rotating brushes, circuit connections between the terminals and the signaling instruments, a polarized relay, circuit connectionsleading from one of the brushes to one set of coils of the relay, circuit connections leading from the other brush to the other set of coils of the relay, energizing-circuit connections leading from the relay-coils, said connections including a suitable source of electrical energy with which the signaling instruments are in circuit, a receiver, circuit connections between a magnet 01": the receiver and the armature of the relay, a pair of contacts cooperating with the relay-armature, one of said contacts being in circuit with one set of connections from the selector to the relay-coils and the other contact being in circuit with the other set of connections from the selector to the relay coils, the coils being so wound and the armature so polarized that the movement of the armature shunts the coils which cause the movement of the armature, and means for rendering inoperative the energizing-circuit connections for the relay-coils after the armature has been moved to establish a connection between the selector and the receivermagnet, substantially as described.

28. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments, each embodying an electrically-controlled starting mechanism, of a main line to which said signaling instruments are connected, a circuit for each starting mechanism, devices in each signaling instrument whereby its starting mechanism is thrown into the main line, a selector embodying a series of terminals and two rotating brushes, circuit connections between the terminals of the selector and the signaling instruments, a polarized relay, circuit connections between one of the brushes and one set of coils of the relay, circuit connections between the other brush and the other set of coils of the relay, a branch from the mainline return, said branch being suitably connected to the relay-coils so as to form an energizing-circuit therefor, a receiver, a branch from the main-line return including one of the receiver-magnets and the relay-armatu re, a pair of contacts, one being in circuit with the connections from one brush to one set of relay-coils and the other being in circuit with the connections from the other brush to the other set of relay-coils, the coils being so wound and the armature so polarized that the movement of the armature shunts the coils which cause the movement of the armature, and means for rendering inoperative the energizing branch leading to the relaycoils after the armature has been moved to establish a connection between the selector and the receiving-magnet, substantially as described.

29. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments, each embodying an electricallycon trolled starting mechanism, of a main line to which said signaling instruments are connected, a circuit for each starting mechanism, devices in each signaling instrument whereby its starting mechanism is thrown into the main line, a selector embodying a series of terminals and two rotating brushes, connections between the terminals and the signaling instruments, a motor-circuit, an electrical controlling device for said circuit, a circuit for said electrical controlling device including a branch from the main-line return and branches to each of the signaling instruments, a multiple-circuit controller, circuit connections between each brush of the selector and the circuit-controller, a branch from the main line leading to said controller, a controller for said branch, electrical actuating devices for said controller located in a branch, a receiver, and a branch from the main-line return including a receiver-magnet and leading to the circuit-controller, substantially as described.

30. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments, each embodying an electrically-controlled starting mechanism,of a main line to which said signaling instruments are connected, a circuit for each starting mechanism, devices in each signaling instrument whereby its starting mechanism is thrown into the main line, a selector embodying a series of terminals and two rotating brushes, connections between the terminals and the signaling instruments, a motor-circuit, an electrical controlling device for said circuit, a circuit for said electrical controlling device including a branch from the main-line return and branches to each of the signaling instruments, a multiple circuit controller, circuit connections between each brush of the selector and the circuit-controller, a branch from the main line leading to said controller, a controller for said branch, electrical actuating devices for said controller located in a branch, a receiver, a branch from the mainline return including a receiver-magnet and leading to the multiple-circuit controller, and means operated from the receiver-magnet for rendering the motor-controlling circuit inoperative during the time when [he receiver is receiving a signal from any signaling instrument, substantially as described.

31. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments, each embodying an the receiver is connected to any signaling in-' electrically-controlled starting mechanism,of a main line to which said signaling instruments are connected, a circuit for each starting mechanism, devices in each signaling instrument whereby its starting mechanism is thrown into the main line, a selector embodying a series of terminals and two rotating brushes, connections between the terminals and the signaling instruments, a motor-circuit, an electrical controlling device for said circuit, a circuit for said electrical controlling device including a branch from the main-line return and branches to each of the signaling instruments, a polarized relay, circuit connections between one brush ot' the selector and one set'of coils of the relay and between the other brush and the other set of coils of the relay, a branch from the main-line return, an electrically-operating controller for said branch, the operating devices for which are included in a branch from the motor-circuit, a receiver, a branch from the main-line return including the receiver andleading to the armature of the polarized relay, a pair of contacts with which the armature of the relay cooperates, one ofsaid contacts being in circuit with the connections leading from the selector to one set of relay-coils and the other contact being in circuit with the connections leading from the selector to the other set of relay-coils, the coils being so wound and the armature so polarized that the movement of the armature shunts the coils which cause the movement of the armature, and means for rendering inoperative the controlling-circuit for the motor-circuit during the time when strument and is receiving a signal therefrom, substantially as described.

32. In an electrically-controlled signaling system, the combination with a plurality of signaling instruments, each embodying an electrically-controlled starting m'echanism,of a main line to-which said signaling instruments are connected, a circuit for each starting mechanism, devices in each signaling instrument whereby its starting mechanism is thrown into the main line, a selector embodying a series of terminals and two rotating brushes, connectionsvbetween the terminals and the signaling instruments, a motor-circuit, an electrical controlling device for said circuit, a circuit for said electrical controlling device including a branch from the main-line return and branches to each of the signaling instruments, a polarized relay, circuit connections between one brush of the selector and one set of coilsof the relay and between .the other brush and the other set of coils of the relay, a branch from the main-line return, an electrically-operated controller for said branch, the operating devices for which are included in a branch from the. motor-circuit, a receiver, a branch from the main-linereturn,.including the receiver and leading tothe armature of the polarized relay, a pair of contacts with which the armature of the relay cooperates,'one of said contacts being in circuit with the connections leading from the selector to one set of relay-coils and the other contact being in circuit with the connections leading from the selector to the other set of relay-coils, the coils being so wound and the" armature so polarized that the movement of the armature shunts the coils which cause the movement of the armature, and means controlled by the receiver for rendering inoperative the controlling-circuit for the motorcircnit during the time when the receiver is connected to any signaling instrument and is receiving a signal therefrom, substantially as described.

33. In a signaling system, the combination with a plurality of signaling instruments, of a selector, a stopping mechanism therefor, a motor-circuit for controlling the operation of the selector, a controlling-circuit for the motor-circuit which is rendered operative and inoperative by each signaling instrument,-a multiple-circuit controller, an energizing-circuit therefor having branches which lead to the selector,a controller for the energizing-circuit, a receiver, a circuit including the signaling instruments, the selector, and a receiver-magnet, said circuit being controlled by the multiple-circuit controller, a startingmagnet for each signaling instrument, the circuit for each magnet being controlled by the selector, means whereby the operation of a signaling instrument renders the control ling-circuit for the motor-circuit inoperative, means thrown into action when the controlling-circuit for the motor-circuit is rendered inoperative for rendering inoperative the en ergizing-circuit of the multiple-circuit controllerand applying the stopping mechanism to the selector, and means controlled by the receiver for rendering the motor-controlling circuit inoperative during the time when the receiver is receiving a signal from any sig naling instrument, snbstantantially as described.

circuit including one of the magnets of the receiver and one set of circuit-closing devices, a selector, a motor-circuit for controlling the action of the selector, a stopping mechanism for the selector, a multiple-circuit controller, an energizing circuit therefor having branches which include the circuit-controller and which lead to the selector, a controller for this circuit, a circuit controlled by the multiple-circuit controller and including another magnet of the receiver, a controllingmagnet for the motor-circuit, a starting-magnet, the circuit for which is under the controlof the selector, means whereby the signaling instruments render operative and inoperative the controlling-circuit for the mo tor-circuit, means whereby when the motorcircuit is rendered inoperative the stopping mechanism for the selector is actuated and the energizing-circuit for the multiple-circuit controller is rendered inoperative, and means Controlled by the receiver for maintaining the controlling-circuit for the motor-circuit in inoperative condition during the time when the receiver is receiving a signal, substantially as described.

35. In a signaling system, the combination with a plurality of signaling instruments, of a sunflower selector having two movable contacts, a stopping mechanism for the selector, a motor-circuit for controlling the operation of the selector, a controlling-circuit for the motor-circuit which is rendered operative and inoperative by each signaling instrument, a polarized relay forming a multiple circuit controller, an actuating-circuit for the polarized relay having two branches which include the coils of the relay magnet and each of which leads to one of the movable contacts, a controller for both branches of the energizing-circuit, a receiver, a circuit leading from the receiver and adapted to be electrically connected by the polarized relay to either branch of the actuating-circuit, a startingmagnet for each signaling instrument, the circuit foreach magnet being controlled by the selector, means whereby the starting of the signaling instrument renders the controllingcircuit for the motor circuit inoperative, means thrown into action when the controlling-circuit for the motor-circuit is rendered inoperative for rendering the actuating-circuit of the polarized relay-magnet inoperative, and applying the stopping mechanism to the selector, and means controlled by the receiver for rendering the controlling-circuit inoperative during the time when the receiver is receiving a signal from any signaling instrument, substantially as described.

36. In a signaling system, the combination with a receiver employing a plurality of magnets, of a plurality of signaling instruments, each having a plurality of sets of circuitclosing devices, each set of devices being adapted to send a series of impulses over the forming a multiple-circuit controller, an energizing-circuit having two branches, each of which includes the relay-magnets and one of said branches leading to one of the movable contactsof the selector, and the other leading to the other movable contact of the selector, a controller for this circuit, said controller being actuated by means included in a branch of the motor-circuit, a circuit leading from the polarized relay to a receivermagnet and adapted to be connected by the relay to either branch of the energizing-circuit, a controlling-circuit for the motor-air cuit, a starting-magnet for each signaling instrument, the circuit for which is under the control of the selector, means whereby the signaling instruments render operative and inoperative the controlling-circuit for the motor-circuit, a circuit including the actuating devices of the stopping mechanism, said circuit being controlled from the controlling-circuit for the motor-circuit, and the arrangement being such that the stopping mechanism is thrown into operation when the motor-circuit is broken, and means controlled by the receiver for maintaining the controlling-circuit for the motor-circuit in inoperative condition during the time when the receiver is receiving a signal from any signaling instrument, substantially as described.

In testimonywvhereof I have hereunto set my hand in the presence of two subscribing witnesses.

HENRY GUY CARLETON.

Witnesses:

T. F. Knnon, A. A. V. BOURKE. 

